暗記メーカー

暗記メーカー

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FINAL

FINAL
54問 • 1年前
  • ユーザ名非公開
    • 通報

    問題一覧

  • 1

    Molecules are responsible for scattering light which causes the colors of the sunset.

    true

  • 2

    A scientific law is a brief statement that summarizes past observations and predicts future ones

    true

  • 3

    What is a scientific theory?

    A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of evidence and repeated experimentation. It explains why phenomena occur.

  • 4

    Charcoal was burned in a barbecue grill. The ashes that remained weighed considerably less than the charcoal that was burned. Does this mean that the law of conservation of mass is wrong? Explain.

    No

  • 5

    What is a scientific law?

    A scientific law is a statement that describes a consistent relationship observed in nature, often expressed mathematically.

  • 6

    In multiplication and division calculations, the answer will have the same number of decimal places as the number carrying the fewest decimal places.

    false

  • 7

    Does mass depend on gravity?

    No

  • 8

    The prefix nano represents the multiplier 0.000000001.

    true

  • 9

    Suppose a symmetrical metal rod of the element lead has a density of 11.4 g/cm3. If this rod is cut in half, the density of each piece is now 5.7 g/cm3.

    false

  • 10

    The distance between the two hydrogen atoms in a molecule of water is 0.000000000172 m. Express this distance in scientific notation.

    1.72 x 10-10m

  • 11

    Suppose a thermometer has marks at every one-degree increment and the mercury level on the thermometer is exactly between the 25- and 26-degree Celsius marks. We should properly report the temperature measurement as?

    25.5

  • 12

    How many grams are in 1.48 × 107 μg?

    14.8 g

  • 13

    What is the volume of 19.6 g of a liquid that has a density of 0.967 g/mL?

    20.3 mL

  • 14

    How many significant figures should be reported in the answer to the following calculation? (43.980) × (19.0023 + 25) =

    6 significant figures

  • 15

    When rounding the number 2.348615 to 4 significant figures, what is the correct value?When rounding the number 2.348615 to 4 significant figures, what is the correct value?

    2.349

  • 16

    What is the final temperature of 25.0 grams of water at 22.0°C after it absorbs 454J of heat? (report with the correct number of sig. figs.)

    26.3

  • 17

    How much heat (kJ) is absorbed by 948.0 g of water in order for the temperature to increase from 25.00°C to 32.50°C? (report with the correct number of sig. figs.)

    29.7

  • 18

    What is the value of -25°C on the Kelvin scale?

    248.15

  • 19

    A sample of 508.4 grams of copper completely reacted with oxygen to form 572.4 grams of a copper oxide product. How many grams of oxygen must have reacted?

    64.0

  • 20

    The atom is the fundamental building block of everything we hear, feel, see, and experience.

    true

  • 21

    The atomic number of nitrogen is 14.01.

    false

  • 22

    What is Daltons Atomic Theory

    All matter is composed of extremely small particles called atoms.

  • 23

    How is the atomic mass unit defined?

    1/12 the mass of a carbon 12 atom

  • 24

    What is the atomic symbol for tin?

    Sn

  • 25

    What are group 7A elements called?

    Halogens

  • 26

    How many protons and electrons are present in O2-?

    8 pro , 10 elect

  • 27

    What are isotopes?

    Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons

  • 28

    How many neutrons are present in Ne-22?

    12

  • 29

    What is the charge on an ion that has an atomic number of 24 and contains 22e-?

    +2

  • 30

    What is the law of constant composition?

    a given chemical compound always contains its component elements in a fixed ratio (by mass) and does not depend on its source or method of preparation.

  • 31

    The oxygen-to-hydrogen mass ratio of water is always 8.0 is an example of what fundamental law?

    Law of definite proportions

  • 32

    What is the oxygen-to-hydrogen mass ratio for H202?

    15.84:1

  • 33

    The phosphorous-to-hydrogen mass ratio is 10.2 for a compound. This ratio could correspond to what chemical formula?

    PH3

  • 34

    How many of each type of atoms are there in the formula NH4C2H302?

    1, 7 , 2 , 2

  • 35

    What is the name of the ionic compound made of beryllium and chlorine?

    beryllium chloride

  • 36

    What is the name of CoS?

    Cobalt (II) sulfide

  • 37

    The charge of a vanadium ion in the compound V205 is?

    +5

  • 38

    What is the formula mass for diboron tetrachloride?

    163.38

  • 39

    If the mass ratio of K to F in a compound is 2.06:1, how many grams of F are needed to react with 2.30 g of K?

    1.12

  • 40

    A red shirt appears red to our eyes because the shirt absorbs the red wavelengths of visible light.

    False

  • 41

    Electrons behave like particles and we can describe their exact paths.

    false

  • 42

    The elements will lose or gain electrons as needed to have an electron configuration that matches a noble gas.

    true

  • 43

    The n =__principal shell is the lowest that may contain a d-subshell.

    3

  • 44

    How many electrons are unpaired in the orbitals of carbon?

    2 unpaired electrons

  • 45

    The structure: HEH: is a proper representation of the bonding in the the molecule.

    False

  • 46

    The total number of electrons to be counted for the Lewis structure of the PO43-?

    32

  • 47

    What is the molecular geometry if you have 4 single bonds around the central atom?

    tetrahedral

  • 48

    Which of the compounds would have a linear molecular geometry? (N2, H2S, CO2)

    N2 and CO2

  • 49

    What is a separation of charge WITHIN a bond?

    a dipole moment

  • 50

    Consider the following electronegativity values: H = 2.1, Cl = 3.0, F = 4.0. Which molecule below would you expect to have the more polar bond? (H2, Cl, F2, HC, HF)

    HF

  • 51

    How many lone electron pairs does the CIO (-1 charged) polyatomic anion have?

    3 lone pairs

  • 52

    The following equation IS balanced: 2 C4H100 + 13 02 → 8 CO2 + 10H20

    false

  • 53

    A reaction in which a substance reacts with oxygen, emitting heat and forming oxygen-containing compounds is an example of what type of reaction?

    combustion

  • 54

    What is a redox reaction?

    a chemical reaction in which electrons are lost from one substance (oxidation) and added to another (reduction).

    • Chem

    Chem

    ユーザ名非公開 · 50問 · 1年前

    Chem

    Chem

    50問 • 1年前
    ユーザ名非公開

    chem 1

    chem 1

    ユーザ名非公開 · 22問 · 1年前

    chem 1

    chem 1

    22問 • 1年前
    ユーザ名非公開

    問題一覧

  • 1

    Molecules are responsible for scattering light which causes the colors of the sunset.

    true

  • 2

    A scientific law is a brief statement that summarizes past observations and predicts future ones

    true

  • 3

    What is a scientific theory?

    A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of evidence and repeated experimentation. It explains why phenomena occur.

  • 4

    Charcoal was burned in a barbecue grill. The ashes that remained weighed considerably less than the charcoal that was burned. Does this mean that the law of conservation of mass is wrong? Explain.

    No

  • 5

    What is a scientific law?

    A scientific law is a statement that describes a consistent relationship observed in nature, often expressed mathematically.

  • 6

    In multiplication and division calculations, the answer will have the same number of decimal places as the number carrying the fewest decimal places.

    false

  • 7

    Does mass depend on gravity?

    No

  • 8

    The prefix nano represents the multiplier 0.000000001.

    true

  • 9

    Suppose a symmetrical metal rod of the element lead has a density of 11.4 g/cm3. If this rod is cut in half, the density of each piece is now 5.7 g/cm3.

    false

  • 10

    The distance between the two hydrogen atoms in a molecule of water is 0.000000000172 m. Express this distance in scientific notation.

    1.72 x 10-10m

  • 11

    Suppose a thermometer has marks at every one-degree increment and the mercury level on the thermometer is exactly between the 25- and 26-degree Celsius marks. We should properly report the temperature measurement as?

    25.5

  • 12

    How many grams are in 1.48 × 107 μg?

    14.8 g

  • 13

    What is the volume of 19.6 g of a liquid that has a density of 0.967 g/mL?

    20.3 mL

  • 14

    How many significant figures should be reported in the answer to the following calculation? (43.980) × (19.0023 + 25) =

    6 significant figures

  • 15

    When rounding the number 2.348615 to 4 significant figures, what is the correct value?When rounding the number 2.348615 to 4 significant figures, what is the correct value?

    2.349

  • 16

    What is the final temperature of 25.0 grams of water at 22.0°C after it absorbs 454J of heat? (report with the correct number of sig. figs.)

    26.3

  • 17

    How much heat (kJ) is absorbed by 948.0 g of water in order for the temperature to increase from 25.00°C to 32.50°C? (report with the correct number of sig. figs.)

    29.7

  • 18

    What is the value of -25°C on the Kelvin scale?

    248.15

  • 19

    A sample of 508.4 grams of copper completely reacted with oxygen to form 572.4 grams of a copper oxide product. How many grams of oxygen must have reacted?

    64.0

  • 20

    The atom is the fundamental building block of everything we hear, feel, see, and experience.

    true

  • 21

    The atomic number of nitrogen is 14.01.

    false

  • 22

    What is Daltons Atomic Theory

    All matter is composed of extremely small particles called atoms.

  • 23

    How is the atomic mass unit defined?

    1/12 the mass of a carbon 12 atom

  • 24

    What is the atomic symbol for tin?

    Sn

  • 25

    What are group 7A elements called?

    Halogens

  • 26

    How many protons and electrons are present in O2-?

    8 pro , 10 elect

  • 27

    What are isotopes?

    Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons

  • 28

    How many neutrons are present in Ne-22?

    12

  • 29

    What is the charge on an ion that has an atomic number of 24 and contains 22e-?

    +2

  • 30

    What is the law of constant composition?

    a given chemical compound always contains its component elements in a fixed ratio (by mass) and does not depend on its source or method of preparation.

  • 31

    The oxygen-to-hydrogen mass ratio of water is always 8.0 is an example of what fundamental law?

    Law of definite proportions

  • 32

    What is the oxygen-to-hydrogen mass ratio for H202?

    15.84:1

  • 33

    The phosphorous-to-hydrogen mass ratio is 10.2 for a compound. This ratio could correspond to what chemical formula?

    PH3

  • 34

    How many of each type of atoms are there in the formula NH4C2H302?

    1, 7 , 2 , 2

  • 35

    What is the name of the ionic compound made of beryllium and chlorine?

    beryllium chloride

  • 36

    What is the name of CoS?

    Cobalt (II) sulfide

  • 37

    The charge of a vanadium ion in the compound V205 is?

    +5

  • 38

    What is the formula mass for diboron tetrachloride?

    163.38

  • 39

    If the mass ratio of K to F in a compound is 2.06:1, how many grams of F are needed to react with 2.30 g of K?

    1.12

  • 40

    A red shirt appears red to our eyes because the shirt absorbs the red wavelengths of visible light.

    False

  • 41

    Electrons behave like particles and we can describe their exact paths.

    false

  • 42

    The elements will lose or gain electrons as needed to have an electron configuration that matches a noble gas.

    true

  • 43

    The n =__principal shell is the lowest that may contain a d-subshell.

    3

  • 44

    How many electrons are unpaired in the orbitals of carbon?

    2 unpaired electrons

  • 45

    The structure: HEH: is a proper representation of the bonding in the the molecule.

    False

  • 46

    The total number of electrons to be counted for the Lewis structure of the PO43-?

    32

  • 47

    What is the molecular geometry if you have 4 single bonds around the central atom?

    tetrahedral

  • 48

    Which of the compounds would have a linear molecular geometry? (N2, H2S, CO2)

    N2 and CO2

  • 49

    What is a separation of charge WITHIN a bond?

    a dipole moment

  • 50

    Consider the following electronegativity values: H = 2.1, Cl = 3.0, F = 4.0. Which molecule below would you expect to have the more polar bond? (H2, Cl, F2, HC, HF)

    HF

  • 51

    How many lone electron pairs does the CIO (-1 charged) polyatomic anion have?

    3 lone pairs

  • 52

    The following equation IS balanced: 2 C4H100 + 13 02 → 8 CO2 + 10H20

    false

  • 53

    A reaction in which a substance reacts with oxygen, emitting heat and forming oxygen-containing compounds is an example of what type of reaction?

    combustion

  • 54

    What is a redox reaction?

    a chemical reaction in which electrons are lost from one substance (oxidation) and added to another (reduction).